US4864293A - Inground boring technique including real time transducer - Google Patents
Inground boring technique including real time transducer Download PDFInfo
- Publication number
- US4864293A US4864293A US07/188,958 US18895888A US4864293A US 4864293 A US4864293 A US 4864293A US 18895888 A US18895888 A US 18895888A US 4864293 A US4864293 A US 4864293A
- Authority
- US
- United States
- Prior art keywords
- drill string
- boring tool
- signal
- ground
- section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
Definitions
- the present invention relates generally to boring apparatus and more particularly to an arrangement for collecting inground bore hole data and for transmitting the data to an above ground location in real time.
- the present invention is directed specifically to the transmission of data rather than the actual means for gathering it.
- this gathering means is a transducer which generates an AC signal containing the desired data
- one way to transmit the signal to ground level from the boring device where the signal is generated is to use the cooperating drill string as the conductor, assuming of course that the drill string body defines a continuous electrically conductive path to ground level.
- a typical way in which the AC signal is first coupled to the drill string from the boring device and the way that it is typically decoupled from the drill string at ground level is by means of inductive coupling utilizing, for example, a toroidal transformer. While this technique presents no serious problems at ground level where there is sufficient room, applicant has found that a toroidal transformer or other such inductive means is quite difficult to use within the confines of the hole being drilled.
- a boring apparatus including a boring tool and a drill string is disclosed herein.
- the boring tool is designed to bore a hole through the ground.
- the drill string which is connected at one end with the boring tool and which extends from there to ground level within the hole being formed, serves to urge the boring tool forward.
- the apparatus also includes a transducer or other such information providing means carried by the boring tool for generating an AC signal containing certain inground information between first and second output terminals forming part of the transducer or like means. Means are also provided in accordance with the present invention for transmitting the information containing signal to an above ground location where the information can be extracted from the signal.
- the transmitting means includes: (1) at least a continuous section of the drill string which is sufficiently electrically conductive to carry the signal, (2) the ground surrounding the boring tool as the latter moves through the hole being formed, (3) means for electrically connecting the first output terminal of the transducer or like means directly to the continuous section of the drill string, and (4) means electrically insulated from the drill string section for causing the current to flow from the second terminal to the ground surrounding the boring tool, whereby the electrically conductive drill string section serves to carry the AC signal and the surrounding ground is used as a signal return path.
- FIG. 1 diagramatically illustrates an overall boring system including an inground boring tool and an arrangement designed in accordance with the present invention for transmitting, in real time, data from the boring tool to an above ground location;
- FIG. 2 is an enlarged diagramatic illustration of the data transmission arrangement forming part of the overall apparatus shown in FIG. 1;
- FIGS. 3 and 4 are enlarged diagramatic illustrations of two modified real time data transmission arrangements which could be utilized with the apparatus of FIG. 1.
- FIG. 5 shows as alternative system for use in wet or dry soils which employs a capacitive coupling capability.
- FIG. 1 diagramatically illustrates an overall boring apparatus.
- the apparatus which is generally indicated by the reference numeral 10 includes a boring tool 12 and drill string 14 which, for example, may be of the type described in Geller U.S. Pat. No. 4,674,579 which is incorporated herein by reference.
- the boring tool described in that patent is connected to one end of the drill string and both are urged forward through the soil by a suitable thrust providing device located above ground.
- a corresponding thrust device and associated controls for operating the entire apparatus are generally indicated at 16. It is to be understood at the outset that the present invention does not reside in any particular boring device.
- Any particular drill string is acceptable so long as it is compatible with the present invention as will be described below or any particular thrust providing device and controls.
- Reference to the Geller patent is made for exemplary purposes only. Any suitable boring device, drill string and associated components compatible with the present invention may be readily provided by those with ordinary skill in the art.
- boring tool 12 is shown in operation boring through the soil, thereby forming an inground hole 18.
- the boring tool utilizes fluid cutting jets 20 for cutting through the soil and therefore the hole surrounding the boring tool fills up with cutting or drilling fluid which is generally indicated at 22.
- This cutting or drilling fluid is utilized by the present invention, as will be seen below.
- Arrangement 24 includes a transducer 26 or other such information providing means carried by the boring tool for generating an AC encoded signal containing the information desired.
- a transducer 26 or other such information providing means carried by the boring tool for generating an AC encoded signal containing the information desired.
- One example of a contemplated information providing means is a rotation transducer.
- Other such means could include other types of position or orientation transducers or other data acquisition devices so long as the particular information is encoded and converted to an AC signal containing the particular information being generated.
- transducer or other such device like the boring tool and drill string, does not itself form part of the present invention, other than as part of the overall information gathering and transmitting arrangement.
- means 26 is indeed a rotation transducer with suitable electronics for producing an AC signal containing information about the rotational position of boring device 12 at any given point in time. As illustrated in FIG. 2, the AC signal is produced across two output terminals 28 and 30.
- the encoded signal is at a frequency range of approximately 1 kilohertz to 100 kilohertz with a signal amplitude of approximately a few milliamperes.
- Arrangement 24 like many prior art approaches, utilizes a continuous section of drill string 14 to carry its information containing AC signal to ground level where it can be retrieved and processed. To that end, the drill string or at least a continuous section intended to carry the signal is sufficiently electrically conductive to do so.
- the drill string described in Geller U.S. Pat. No. 4,674,579 is one example. However, as indicated above, in the past the AC signal was typically inductively coupled to the inground end of the drill string by a suitable transformer assembly.
- the AC signal from transducer 26 is not inductively coupled to the drill string but rather directly coupled thereto. More specifically, as illustrated best in FIG. 2, one of the two output terminals of transducer 26, for example, terminal 28, is physically connected to the drill string (e.g. the electrically conductive section). At the same time, the other output terminal, for example terminal 30, is grounded so that the drill string section serves to carry the AC signal while ground serves as a signal return path.
- terminal 30 is physically connected to an electrically conductive collar 32 which extends around the electrically conductive section of drill string 14 but which is electrically insulated from the drill string by a suitable dielectric layer 34. However, the electrically conductive collar is located adjacent boring device 12 and therefore is in contact with the cutting fluid 22. Thus, the electrically conductive collar and therefore terminal 30 are grounded through the drilling fluid and the surrounding ground wall defining hole 18.
- transformer 36 is a toroidal transformer consisting of approximately 100 turns of wire.
- Suitable signal processing circuitry generally indicated at 38 is used to process the retrieved signal so as to retrieve the information contained within the signal. It is to be understood that transformer 36 and processing circuitry 38, like most of the other components of the overall apparatus, are readily providable by those with ordinary skill in the art and, hence, will not be described herein.
- Arrangement 24 forming part of the overall apparatus 10 was described above including the insulated collar 32 exposed to drilling fluid in order to ground output terminal 30 and thereby provide a signal return path through the cutting fluid and the surrounding ground.
- the collar itself can be placed in any suitable convenient position so long as it is electrically insulated from the drill string section carrying the signal and so long as it is indirect contact with the ground or exposed to the cutting or drilling fluid or sufficiently close to the ground to capacitively couple the signal.
- it could be grounded to or part of the outer body of the boring head itself as long as the boring head body is electrically conductive and meets these other requirements.
- An entirely different means for grounding terminal 30 can also be provided, as exemplified in FIGS. 3 and 4, to be discussed immediately below.
- arrangement 10' is shown. This arrangement may be identical to arrangement 10, except for the way in which terminal 30 of its transducer 26 is grounded and, possibly, the particular boring tool used.
- arrangement 10' includes a boring tool 12', for example, an impact device, having an outer body constructed of an electrically conductive material, for example steel, electrically connected to a front section 14A of drill string 14 and electrically insulated from the rest of the drill string by a suitable dielectric separator generally indicated at 40.
- Terminal 28 is connected to the drill string in the manner described above.
- terminal 30 is connected directly (physically) to the outer electrically conductive housing of boring tool 12', or as shown in FIG.
- apparatus 10 is shown and may be identical to apparatus 10 or 10' except for the way in which output terminal 30 of transducer 26 is grounded.
- an insulated collar 42 is disposed around the drill string and carries with it electrically conductive rollers 44 spring biased against the side wall of hole 18 so as to define ground path from terminal 30 through the collar, cooperating biasing spring arms 46 and rollers 44.
- One or more spring bias rollers may be utilized.
- FIG. 5 shows a tool head 50 which has a large forward head section 52 displaying a large surface area for direct contact with the soil 51.
- Forward section 52 is electrically isolated from the pipe 53 by means of insulator 54.
- Head section 52 can be used for boring with or without cutting fluid, e.g. bentonite or water. Its principal of operation is as follows. The thrust force on the drill pipe makes the tool head come into contact with the soil surrounding the tool head. In the event that the soil is very dry or very low in conductivity, the capacitance between the relatively large surface area of the tool head and the soil can become the dominant means of signal flow from the tool head to the surrounding soil. Once the signal is coupled into the ground the remaining signal flow is the same as previously described.
- one terminal 56 at the output of transducer 58 is connected to the drill pipe 53 while the other terminal 60 is connected to head section 52.
- This embodiment is to be contrasted with apparatus 10" in FIG. 4 where there is direct contact between rollers 44 and the soil. In this latter case, the surface area of the rollers is small compared to the surface area of head section 52 of the tool 50 and displays little capacitive coupling as compared to the FIG. 4 embodiment.
Abstract
Description
Claims (12)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/188,958 US4864293A (en) | 1988-04-29 | 1988-04-29 | Inground boring technique including real time transducer |
AU32633/89A AU603754B2 (en) | 1988-04-29 | 1989-04-10 | Inground boring technique including real time transducer |
EP89303610A EP0339825A1 (en) | 1988-04-29 | 1989-04-12 | Apparatus for data transmission in a borehole |
DK200789A DK200789A (en) | 1988-04-29 | 1989-04-25 | DRILLING EQUIPMENT WHEN USING A TIMELY TRANSDUCER |
JP1112752A JPH01315584A (en) | 1988-04-29 | 1989-05-01 | Underground boring technique having instantaneous transducer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/188,958 US4864293A (en) | 1988-04-29 | 1988-04-29 | Inground boring technique including real time transducer |
Publications (1)
Publication Number | Publication Date |
---|---|
US4864293A true US4864293A (en) | 1989-09-05 |
Family
ID=22695282
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/188,958 Expired - Lifetime US4864293A (en) | 1988-04-29 | 1988-04-29 | Inground boring technique including real time transducer |
Country Status (5)
Country | Link |
---|---|
US (1) | US4864293A (en) |
EP (1) | EP0339825A1 (en) |
JP (1) | JPH01315584A (en) |
AU (1) | AU603754B2 (en) |
DK (1) | DK200789A (en) |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU603754B2 (en) * | 1988-04-29 | 1990-11-22 | Utilx Corporation | Inground boring technique including real time transducer |
US5160925A (en) | 1991-04-17 | 1992-11-03 | Smith International, Inc. | Short hop communication link for downhole mwd system |
US5264795A (en) * | 1990-06-18 | 1993-11-23 | The Charles Machine Works, Inc. | System transmitting and receiving digital and analog information for use in locating concealed conductors |
US5394141A (en) * | 1991-09-12 | 1995-02-28 | Geoservices | Method and apparatus for transmitting information between equipment at the bottom of a drilling or production operation and the surface |
US6407550B1 (en) | 1998-08-19 | 2002-06-18 | Metrotech Corporation | Line locator with accurate horizontal displacement detection |
US6556144B1 (en) * | 1999-04-08 | 2003-04-29 | Reuter-Stokes, Inc. (General Electric Company) | Method and apparatus for data communication with an underground instrument package |
US6810972B2 (en) | 2002-02-08 | 2004-11-02 | Hard Rock Drilling & Fabrication, L.L.C. | Steerable horizontal subterranean drill bit having a one bolt attachment system |
US6810973B2 (en) | 2002-02-08 | 2004-11-02 | Hard Rock Drilling & Fabrication, L.L.C. | Steerable horizontal subterranean drill bit having offset cutting tooth paths |
US6810971B1 (en) | 2002-02-08 | 2004-11-02 | Hard Rock Drilling & Fabrication, L.L.C. | Steerable horizontal subterranean drill bit |
US6814168B2 (en) | 2002-02-08 | 2004-11-09 | Hard Rock Drilling & Fabrication, L.L.C. | Steerable horizontal subterranean drill bit having elevated wear protector receptacles |
US6827159B2 (en) | 2002-02-08 | 2004-12-07 | Hard Rock Drilling & Fabrication, L.L.C. | Steerable horizontal subterranean drill bit having an offset drilling fluid seal |
US20050167098A1 (en) * | 2004-01-29 | 2005-08-04 | Schlumberger Technology Corporation | [wellbore communication system] |
WO2014031663A1 (en) | 2012-08-23 | 2014-02-27 | Merlin Technology, Inc. | Drill string inground isolator and method |
US8695727B2 (en) | 2011-02-25 | 2014-04-15 | Merlin Technology, Inc. | Drill string adapter and method for inground signal coupling |
WO2014159293A1 (en) | 2013-03-14 | 2014-10-02 | Merlin Technology, Inc. | Drill string inground isolator housing in an mwd system and method |
US9909707B2 (en) * | 2008-05-14 | 2018-03-06 | Tt Technologies, Inc. | Device and method to split pipe near utilities |
US20180313210A1 (en) * | 2017-04-26 | 2018-11-01 | Tracto-Technik Gmbh & Co. Kg | Drill head for earth boring, Drilling device for earth boring having the drill head, Method to detect objects while earth boring and Use of a receiver for receiving a radio signal in a drill head for earth boring |
US11242745B2 (en) | 2017-04-26 | 2022-02-08 | Tracto-Technik Gmbh & Co. Kg | Drill head for earth boring, drilling device for earth boring having the drill head, method to detect objects while earth boring, and use of direct digital synthesizer as a signal in detecting an obstacle in earth boring |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4884071A (en) * | 1987-01-08 | 1989-11-28 | Hughes Tool Company | Wellbore tool with hall effect coupling |
US5187473A (en) * | 1990-08-31 | 1993-02-16 | Halliburton Company | Bipolar signal amplification or generation |
ES2046133B1 (en) * | 1992-06-23 | 1995-02-16 | Geoservices | PROCEDURE AND INSTALLATION FOR THE TRANSMISSION OF INFORMATION, PARAMETERS AND DATA TO AN ELECTRO-MAGNETIC RECEIVING OR CONTROL ORGAN ASSOCIATED WITH A LONG LONG SUBTERRANAL CHANNEL. |
US6633164B2 (en) | 2000-01-24 | 2003-10-14 | Shell Oil Company | Measuring focused through-casing resistivity using induction chokes and also using well casing as the formation contact electrodes |
US7114561B2 (en) | 2000-01-24 | 2006-10-03 | Shell Oil Company | Wireless communication using well casing |
US6840316B2 (en) | 2000-01-24 | 2005-01-11 | Shell Oil Company | Tracker injection in a production well |
US6662875B2 (en) | 2000-01-24 | 2003-12-16 | Shell Oil Company | Induction choke for power distribution in piping structure |
US6758277B2 (en) | 2000-01-24 | 2004-07-06 | Shell Oil Company | System and method for fluid flow optimization |
US6679332B2 (en) | 2000-01-24 | 2004-01-20 | Shell Oil Company | Petroleum well having downhole sensors, communication and power |
US6633236B2 (en) | 2000-01-24 | 2003-10-14 | Shell Oil Company | Permanent downhole, wireless, two-way telemetry backbone using redundant repeaters |
US6817412B2 (en) | 2000-01-24 | 2004-11-16 | Shell Oil Company | Method and apparatus for the optimal predistortion of an electromagnetic signal in a downhole communication system |
US6715550B2 (en) | 2000-01-24 | 2004-04-06 | Shell Oil Company | Controllable gas-lift well and valve |
US7170424B2 (en) | 2000-03-02 | 2007-01-30 | Shell Oil Company | Oil well casting electrical power pick-off points |
OA12225A (en) | 2000-03-02 | 2006-05-10 | Shell Int Research | Controlled downhole chemical injection. |
US7073594B2 (en) | 2000-03-02 | 2006-07-11 | Shell Oil Company | Wireless downhole well interval inflow and injection control |
MY128294A (en) | 2000-03-02 | 2007-01-31 | Shell Int Research | Use of downhole high pressure gas in a gas-lift well |
BR0108895B1 (en) | 2000-03-02 | 2011-01-25 | method of operating a downhole device in an oil well, and, oil well featuring a borehole and a pipe structure. | |
WO2001065718A2 (en) | 2000-03-02 | 2001-09-07 | Shell Internationale Research Maatschappij B.V. | Wireless power and communications cross-bar switch |
RU2258800C2 (en) | 2000-03-02 | 2005-08-20 | Шелл Интернэшнл Рисерч Маатсхаппий Б.В. | Oil well (variants), method of oil well operation, downhole device supply system and method |
NZ521122A (en) | 2000-03-02 | 2005-02-25 | Shell Int Research | Wireless downhole measurement and control for optimising gas lift well and field performance |
CA2401723C (en) * | 2000-03-02 | 2009-06-09 | Shell Canada Limited | Wireless communication using well casing |
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- 1989-04-12 EP EP89303610A patent/EP0339825A1/en not_active Withdrawn
- 1989-04-25 DK DK200789A patent/DK200789A/en not_active Application Discontinuation
- 1989-05-01 JP JP1112752A patent/JPH01315584A/en active Pending
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Cited By (34)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU603754B2 (en) * | 1988-04-29 | 1990-11-22 | Utilx Corporation | Inground boring technique including real time transducer |
US5264795A (en) * | 1990-06-18 | 1993-11-23 | The Charles Machine Works, Inc. | System transmitting and receiving digital and analog information for use in locating concealed conductors |
US5160925A (en) | 1991-04-17 | 1992-11-03 | Smith International, Inc. | Short hop communication link for downhole mwd system |
US5394141A (en) * | 1991-09-12 | 1995-02-28 | Geoservices | Method and apparatus for transmitting information between equipment at the bottom of a drilling or production operation and the surface |
US6407550B1 (en) | 1998-08-19 | 2002-06-18 | Metrotech Corporation | Line locator with accurate horizontal displacement detection |
US6556144B1 (en) * | 1999-04-08 | 2003-04-29 | Reuter-Stokes, Inc. (General Electric Company) | Method and apparatus for data communication with an underground instrument package |
US6810971B1 (en) | 2002-02-08 | 2004-11-02 | Hard Rock Drilling & Fabrication, L.L.C. | Steerable horizontal subterranean drill bit |
US6810973B2 (en) | 2002-02-08 | 2004-11-02 | Hard Rock Drilling & Fabrication, L.L.C. | Steerable horizontal subterranean drill bit having offset cutting tooth paths |
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Also Published As
Publication number | Publication date |
---|---|
DK200789D0 (en) | 1989-04-25 |
DK200789A (en) | 1989-10-30 |
JPH01315584A (en) | 1989-12-20 |
AU3263389A (en) | 1989-11-02 |
EP0339825A1 (en) | 1989-11-02 |
AU603754B2 (en) | 1990-11-22 |
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